INDIAN ECONOMY QUIZ

In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The minimum length of the coupler will be

Slightly more than 45 mm

45 mm

Slightly less than 45 mm

95 mm

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Longitudinal vibrations are said to occur when the particles of a body moves

None of these

Perpendicular to its axis

In a circle about its axis

Parallel to its axis

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YOUR ANSWER : ?

In a radial cam, the follower moves

In any direction irrespective of the cam axis

In a direction perpendicular to the cam axis

In a direction parallel to the cam axis

Along the cam axis

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In multi V-belt transmission, if one of the belt is broken, we have to change the

There is no need of changing any one as remaining belts can take care of transmission of load

All the belts

Broken belt

Broken belt and its adjacent belts

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In a steam engine, the distance by which the outer edge of the D-slide valve overlaps the steam port is called

Exhaust lap

Lead

Steam lap

None of these

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Which is the false statement about the properties of instantaneous center?

The double center can be denoted either by O2 or O12, but proper selection should be made

The two rigid links have no linear velocities relative to each other at the instantaneous center

The two rigid links which have no linear velocity relative to each other at this center have the same linear velocity to the third rigid link

At the instantaneous center of rotation, one rigid link rotates instantaneously relative to another for the configuration of mechanism considered

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The lower pairs are _________ pairs.

Self-closed

Friction closed

None of these

Force-closed

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The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft, and tan φ = Coefficient of friction between the shaft and bearing)

r sinφ

r tanφ

(r/2) cosφ

r cosφ

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Klein's construction gives a graphic construction for

Acceleration polygon

Four bar chain mechanism

Velocity polygon

Slider-crank mechanism

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The maximum fluctuation of speed is the

Variations of speed above and below the mean resisting torque line

Difference of minimum fluctuation of speed and the mean speed

Difference of the maximum and minimum speeds

Sum of maximum and minimum speeds

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